#include "apue.h"
#include<fcntl.h>

int main(int argc, char *argv[])
{
	int val;

	if(argc != 2)
		err_quit("usage: a.out <descriptor#>");

	if((val = fcntl(atoi(argv[1]), F_GETFL, 0)) < 0)
		err_sys("fcntl error for fd %d", atoi(argv[0]));

	switch(val & O_ACCMODE) {
		case O_RDONLY:
			printf("read only");
			break;
		case O_WRONLY:
			printf("write only");
			break;
		case O_RDWR:
			printf("read write");
			break;
		default:
			err_dump("unknow access mode");
	}

	if(val & O_APPEND)
		printf(", append");
	if(val & O_NONBLOCK)
		printf(", nonblocking");

	if(val & O_SYNC)
		printf(", synchronous writes");

	putchar('\n');
	exit(0);
}
